Grade 80 Hammer Lock Specifications Grade 80 Alloy, Painted SIZE STOCK NUMBER WEIGHT/PIECE WORKING LOAD LIMIT 9/32″-5/16″ HL281-HL312 .40 lbs. 4,500 lbs. 3/8″ HL375 .65 lbs. 7,100 lbs. 1/2″ HL500 1.50 lbs. 12,000 lbs. 5/8″... MSRP: Was: Now: $7.00 - $20.00 Choose Options